2x + y - z = -8 2y + 3z = -6
-1/2x + y + z = -4

For the following matrix, which of the following matrix operations would result in a11 = 1?

A) Multiply row 2 by -1 and add it to row 1

B) Multiply row 3 by -4 and add it to row 1.

C) Multiply row 1 by -1/2

D) Multiply row 1 by 1/2

Twelve less than a number is at most 20

Simplify the expression below -3(10x+4y)+6(6x-2y)

Data on oxide thickness of semiconductors are as follows: 426 432 418 418 421 436 418 408 431 435 423 426 411 434 435 432 411 426 407 439 422 426 412 416 consider this data as a sample of the population. (a) calculate a point estimate of the mean oxide thickness for all wafers in the population. (round your answer to 3 decimal places.) (b) calculate a point estimate of the standard deviation of oxide thickness for all wafers in the population. (round your answer to 2 decimal places.) (c) calculate the standard error of the point estimate from part (a). (round your answer to 2 decimal places.) (d) calculate a point estimate of the median oxide thickness for all wafers in the population. (express your answer to 1 decimal places.) (e) calculate a point estimate of the proportion of wafers in the population that have oxide thickness greater than 430 angstrom. (round your answer to 4 decimal places.)